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Estimados usuarios de R: Tengo dos data frames, A y B, donde hay algunas variables comunes y otras distintas. En el A tengo las variables, a1, a2, a3, a4, a5. En el B tengo las variables a1, a2, a3, b1, b2, b3,b4, b5, b6, b7. Los valores llave son a1 y a2, al data frame B quiero pegarle las variables a4 y a5 y en el caso no se tenga ningun valor en la variable a3, ponerle el valor que aparece

..., NA, "ac", "ad", "ae"),     a2 = c("ba", "bb", "bc", NA, "be"),     a3 = c("ca", "cb", NA, "cd", "ce"),     b1 = c("1aa", "1ab", "1ac", "1ad", "1ae"),     b2 = c("2ba", "2bb", "2bc", "2bd", "2be"),     b3 = c("3ca", "3cb", "3cc", "3cd", "3ce"),     b4 = c("4aa", "4ab", "4ac", "4ad", "4ae"),...

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